Patent US2992122A successfully refreshed from Google Patents.
US2992122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light filtering high-index glass elements
Assignee: 3M Co
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Filing: 1959-02-16
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Granted: 1961-07-11
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Expires: 1979-02-16
Abstract
No abstract record available.
Inventors
- 👤 Warren R Beck
- 👤 Tung Chi Fang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
TRANSPARENT INDIGO BLUE GLASS ELEMENTS, RESISTANT TO WEATHERING, HAVING A THICKNESS NOT EXCEEDING 2 MILLIMETERS, AND HAVING A PEAK IN VISIBLE LIGHT TRANSMISSION BETWEEN .40 AND .52 MICRON, SAID ELEMENTS BEING ESSENTIALLY ABSORPTIVE OF ALL VISIBLE WAVE LENGTHS OF LIGHT OUTSIDE OF SAID RANGE, AND BEING FORMED FROM A GLASS CHARACTERIZED
Claim 2
Dependent Claim
51 words
TRANSPARENT INDIGO BLUE GLASS ELEMENTS, RESISTANT TO WEATHERING, HAVING A THICKNESS NOT EXCEEDING 2 MILLIMETERS, AND HAVING A PEAK IN VISIBLE LIGHT TRANSMISSION BETWEEN .40 AND .52 MICRON, SAID ELEMENTS BEING ESSENTIALLY ABSORPTIVE OF ALL VISIBLE WAVE LENGTHS OF LIGHT OUTSIDE OF SAID RANGE, AND BEING FORMED FROM A GLASS CHARACTERIZED
References Cited (Backward Citations)
US2631106A
Cited
US2720473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |